They answered, i.e. the Reubenites, &c., mentioned Joshua 1:12, to whom Joshua's discourse is confined, Joshua 1:13-15. No doubt the other tribes expressed the same thing; but this is only recorded concerning these, because that might seem most doubtful, and the obedience of the rest was unquestionable.
Related Commentaries of Joshua 1:16
Joshua 1:16
16 And they answered Joshua, saying, All that thou commandest us we will do, and whithersoever thou sendest us, we will go.